Alan Kennedy wrote: > [Alan Kennedy] > >>>On jython 2.1, I use something like this >>> >>>#-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >>>try: >>> enumerate >>>except NameError: >>> def enumerate(iterable): >>> results = [] ; ix = 0 >>> for item in iterable: >>> results.append( (ix, item) ) >>> ix = ix+1 >>> return results > > > [Fredrik Lundh] > >>at least in CPython, using a user-defined enumerate function is a bit >>slower than using the built-in version. > > > Who's using a user-defined enumerate on cpython? > > The above code only defines a user-defined enumerate when the built-in > one doesn't exist, i.e. on jython, which raises NameError on reference > to the non-existent enumerate. > > On cpython, the reference to enumerate doesn't generate a NameError, > therefore the user-supplied version never gets defined, and the builtin > is used. > You are assuming a relatively recent release of CPython. If you look at the stuff that the effbot distributes you will see that most of it supports CPython all the way back to 1.5.2. I don't think many of us have the right to be telling Fredrik what's pythonic and what's not ...
regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Love me, love my blog http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
